Recyclable colorants in plastic beverage containers
A technology of thermoplastic materials and pigments, applied in thin material handling, transportation and packaging, etc., which can solve the problems of economic impossibility, complicated and expensive recycling process, etc.
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Embodiment 1
[0040] This example illustrates the incorporation of polyethylene naphthalate (PEN) fines into a polyethylene terephthalate (PET) base polymer. The PEN homopolymer was frozen with liquid nitrogen and then ground with a 0.5 mm screen applying 0.5-1 lb. / hr. The material was dried in a vacuum oven overnight at 120° C., followed by drying in a desiccant bed for 6 hours. The resulting coarse PEN powder had the consistency of fine sand.
[0041] The PEN powder was blended with Invista 1101 PET at loadings of 1%, 2% and 5% (w / w). The PEN powder was also blended with Wellman HP807 PET at loadings of 2%, 5% and 7.5% (w / w). Standard weight bottle preforms were injection molded at injection molding temperatures of 268°C (Invista 1101 ) and 255°C (Wellman HP807). The balloon is then moldlessly inflated at 60-65 psi and about 95-100°C.
[0042] image 3 Balloons that are free-inflated from compositions containing PEN at loadings of 2%, 5% and 7.5% (w / w) are shown. From image 3 As c...
Embodiment 2
[0044] This example illustrates the incorporation of terephthalic acid (TPA) powder into PET polymer. TPA fine powder (Sigma-Aldrich) was dried under vacuum in a vacuum oven overnight at 100°C. This TPA powder was then blended with Wellman HP 807 PET at loadings of 0.5%, 1%, 2% and 5% (w / w). The TPA powder had the effect of lowering the intrinsic viscosity of the PET resin, as summarized in Table II below.
[0045] Table II
[0046] TPA(weight%)
IV (dL / g)
0
0.67
0.5
0.5
1
0.46
5
0.36
[0047] Standard weight bottle preforms were injection molded at an injection temperature of 262°C. The preform is shown with the control preform in the Figure 5 , where the control preform was prepared from PET resin without TPA added. Typically, TPA was found to cause degradation of the PET polymer (note the lowering of the IV above) and also acts as a nucleating agent, causing crystallization during injection molding, by F...
Embodiment 3
[0050] This example illustrates the incorporation of high melting point PET fines into a PET blend. Virgin PET (Invista 1101 ) with an average particle size of about 350-500 microns was ground to an average particle size of about 100 microns. The material has melting temperatures of 237°C and 245°C. The DSC of untreated PET fines is shown in Figure 8 middle.
[0051] A portion of the PET fines was annealed by heating in the reaction vessel with a nitrogen purge flow, starting at 410°F and increasing to 435°F over three days, and held at 435°F for two weeks. The DSC of nitrogen-treated PET fines is described in Figure 9 middle. The nitrogen treated PET fines had a melting temperature of 248°C and were severely yellowed (discarded).
[0052] Another portion of the PET pellets was annealed by heating in a vacuum furnace at 410°F for two weeks. The DSC of vacuum furnace treated PET fines is shown in Figure 10 middle. The vacuum oven treated PET granules had a melting te...
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